LG GD310 Service Manual page 102

with RF Cable and TP2 of C420
Check TP3, TP4 of FL400 ?
Figure 30 Mobile SW
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Only for training and service purposes
Checking Flow
Check TP1 of SW400
TP1 Signal same
as TP2?
Yes
Yes
Control Signal is
OK ?
Yes
TP5 Signal is
OK ?
Yes
Mobile SW & FEM is OK.
Check Antenna.
No
Replace Mobile SW
(SW400)
Replace BB CHIP (U101)
No
Replace FEM (FL400)
No
EGSM TX
Figure 31 FEM Control Signals
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5. TROUBLE SHOOTING
TP1(ANT SW1)
TP2(ANT SW2)
LGE Internal Use Only